function callajax(url, pageElement, callMessage, errorMessage) 
{ document.getElementById(pageElement).innerHTML = callMessage; try { req = new XMLHttpRequest();
 /* e.g. Firefox */
 } catch(e) { try { req = new ActiveXObject("Msxml2.XMLHTTP");
 /* some versions IE */
 } catch (e) { try { req = new ActiveXObject("Microsoft.XMLHTTP");
 /* some versions IE */ 
} catch (E) { req = false; } } } req.onreadystatechange = function() 
{responseajax(pageElement, errorMessage);}; req.open("GET",url,true); req.send(null); } 

function responseajax(pageElement, errorMessage) { if(req.readyState == 4) { if(req.status == 200) 
{ output = req.responseText; document.getElementById(pageElement).innerHTML = output; } 
else { document.getElementById(pageElement).innerHTML = errorMessage+"\n"+responseText; } } }